Head-block for saw-mills



2 Sheets-Sheet 1.

(No Model.)

P. P. ZIEGLER.

HEAD BLOCK FOR SAW MILLS.

N0. 387,030. Patented July 31, 1888.

N. PETERS. PhomLm-n n nu, Walhingtam n. c.

(No Model.) 2 Sheets-Sheet 2.

F. P. ZIEGLER.

HEAD BLOOK FOR SAW MILLS.

No. 387,030. Patented July 31. 1888.-

\l l- 7 I 17 O l J III a 6 N PETERS, Pnmo-Lhhognbher, Wiihlllgicn. 0.1:.

. back and forth on the same.

UNITED STATES PATENT Grrrcn.

FRANKLIN PIERCE ZIEGLER, OF ABDERA, PENNSYLVANIA.

HEAD-BLOCK FOR SAW-MILLS.

SPECIFICATION forming part of Letters Patent No. 387,030, dated July 31,1888.

Application filed March 15, 1888. Serial No. 267.258. (No model.)

To all whom it may concern.-

Be it known that I, FRANKLIN PIERCE ZIEG- LER, a citizen of the UnitedStates, residing at Abdera, in the county of Clinton and State ofPennsylvania, have invented new and useful Improvements in Head-Blocksfor Saw-Mills, of which the following is a specification.

My invention relates to improvements in head blocks for saw-mills; andit consists in the peculiar construction and combination of devices,that will be more specifically set fort-h hereinafter, and particularlypointed out in the claims.

The object of my invention is to provide means whereby lost motionbetween the pin ions and racks employed to operate the knee will beobviated, and whereby the knee may be moved forward or rearward veryrapidly, and thus enable the lumbermen to save time in operating themill.

In the accompanying drawings, Figure l is aside elevation of ahead-block embodying my improvements. Fig. 2 is a similar view of theopposite side of the same. Fig. 3 is a top plan view of the same. Fig. 4is an end elevation of a modified form of my invention, wherein the cogson the pinions and racks do not break joints. Fig. 5 is a transversesection.

A represents the head-block, which consists of a vertical web, B, havinga broadened base, 0, and a head, D, forming flanges E, which projectfrom opposite sides of the web.

F represents the knee, the base of which rests upon the head D and isadapted to slide From opposite sides of the knee, at a suitabledistanceabove the base thereof, and at suitable regular distances apart,project offsets G; also from opposite sides of the knee, in advance andin rear of the rear offset, G, project brackets or lugs H, which extendin a horizontal direction.

I represents a pair of rack-bars, which are provided on their innersides with grooves 0r recesses K, that adapt them to receive the flangesE, and thereby the inner sides of the rack-bars bear against the sidesof the web B and against the sides of the base of the knee. From theupper sides of the rack-bars, and formed integrally with the same,project ears L, which correspond in number with the offsets G andregister with the same, and said ears are provided with longitudinalslots M.

N represents adj listing-screws, which extend through the slots M andengage threaded openings in the offsets G, and thereby secure the k outof line with the offsets on the opposite side thereof, so that theoffsets are diagonally arranged with relation to each other, and therebythe rack-teeth O of each rack-bar are opposite the spaces between therack-teeth of the other rack-bar.

P represents adj usting-screws which extend through and engage threadedopenings in the outer ends of the cars or lugs H, and the points of saidscrews bear against the front and rear edges of the rear lugs, L, on therack-bars I, and when the screws N are loosened said rackbars may beadjusted longitudinally, as before stated, by turning theadjusting-screws P, for the purpose to be hereinafter explained.

It represents the sills, which are arranged transversely under thehead-blocks on which the latter are secured. These sills project beyondthe outer side of the head-block, and one of the same is provided with avertical arm, S, and with a vertical standard, T, the latter beingarranged beyond the arm.

Urepresents a shaft, which is journaled in a transverse opening in thehead-block and in a bearing in the upper end of a standard, T, and tothe said shaft, on opposite sides of the headblock and in closeproximity thereto, are keyed pinions V, which pinions mesh with theteeth 0 of the rack-bars I. Inasmuch as the teeth of the rack-bars areout of line with each other, and inasmuch as the teeth of the pinionsengage the teeth of the rack-bars, it follows that the teeth of thepinions are also arranged out of line with each other.

T represents a miter-wheel, which is keyed to the shaft U and engages amiter-wheel, X, secured to the lower end of the shaft Y, which shaft Yis journaled vertically in a pair ofhori zontal brackets that projectrearwardly from the upper end of arm S. To the upper end of shaft Y iskeyed a hand-wheel, Z.

The operation of my invention is as follows: By turning the hand-wheeland shaft Y and miter-wheel X rotary motion is imparted to which thehand-wheel is turned. There being two of the pinions and two rack-barson opposite sides of the head-block, the knee is constantly impelled ina straight line and entirel y relieved of side strain and friction, andis consequently adapted to be moved very easily. Moreover, by reason ofthe teeth of the rack-bars and the teeth of the pinions being out ofline with each other, there is no lost motion or play between the teethof the pinions and the teeth of the rackbars, and consequently the kneemay be moved to exactly the distance required in order to cause thelumber to be sawed evenly. By adapting the rack-bars I to belongitudinally adjusted, as hereinbei'ore described, compensation may bemade for wear caused by the friction of the teeth of rack-bars andpiuions, thereby enabling the device to be used for a very long periodof time and preserving its efficiency unimpaired.

By means of the shaft Y, geared to the pin ion-shaft, and the hand-wheelsecured to shaft Y, the knee may be moved in either direction by thelumberman or sawyer with maximum rapidity and with comparative ease.

Having thus described my invention, I claim 1. The combination of thehead block, the knee movablelongitudinally thereon and having therack-bars on opposite sides bearing against the sides of the head-blockand forming guides for the knee, and the shaft U, having the pinionsmeshing with the rack-bar S, for the purpose set forth, substantiall yas described.

2. The combination of the head-block, the knee movable longitudinallythereon,the rackof line with each other, substantially as described.

4. The combination of the head-block, the knee, the rack-bars onopposite sides of the knee and head-block, having the longitudinal slotsM, and the screws N, extending through said slots and entering threadedopenings in the knee, said screws clamping the rack-bars to the knee atany desired adjustment, and the pinions meshing with the l'ackbars,substantially as described.

5. The .combination of the head-block, pinions on opposite sides of thesame, the knee movable longitudinally on the head-block and having theprojecting lugs or brackets H, the rack-bars having the lugs L, providedwith longitudinal slots M and bearing against opposite sides of the kneeand head-block, the clamping-nuts extending through said slots andengaging the knee to secure the rack-bars to the latter, and the adjustingscrews P, engaging threaded openings in arms or brackets H andengaging the lugs or cars L of the rackbars, for the purpose set forth,substantially as described. 7

In'testimony'thatI claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

FRANKLIN PIERCE ZIEGLER.

Witnesses:

'1. M. STEVENSON, H. T. HARMONY.

